Pub Date : 2016-04-04DOI: 10.1109/BIOWIRELESS.2016.7445552
R. A. Fathy, Haofei Wang, Lingyun Ren
RF and optical based photoplethysmography (PPG) have been recently developed for non-contact vital sign detection, due to their numerous advantages. In this paper, UWB radar, and camera-based monitoring are applied in vital sign detection and compared. In this paper, a mathematical signal model for the UWB Doppler radar, and another one for the camera-based photoplethysmography PPG are introduced. Vital signals have been recorded using both methods and compared. Capabilities and limitations of multiple subjects tracking have been demonstrated for multiple heartbeat detection. For validation, experimental results were compared to commercial contact sensors as well. Furthermore, the pros and cons of the Doppler radar and remote PPG in vital signs detection is discussed and summarized.
{"title":"Comparison of UWB Doppler radar and camera based photoplethysmography in non-contact multiple heartbeats detection","authors":"R. A. Fathy, Haofei Wang, Lingyun Ren","doi":"10.1109/BIOWIRELESS.2016.7445552","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445552","url":null,"abstract":"RF and optical based photoplethysmography (PPG) have been recently developed for non-contact vital sign detection, due to their numerous advantages. In this paper, UWB radar, and camera-based monitoring are applied in vital sign detection and compared. In this paper, a mathematical signal model for the UWB Doppler radar, and another one for the camera-based photoplethysmography PPG are introduced. Vital signals have been recorded using both methods and compared. Capabilities and limitations of multiple subjects tracking have been demonstrated for multiple heartbeat detection. For validation, experimental results were compared to commercial contact sensors as well. Furthermore, the pros and cons of the Doppler radar and remote PPG in vital signs detection is discussed and summarized.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130989018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-04DOI: 10.1109/BIOWIRELESS.2016.7445557
Haofei Wang, L. Ren, E. Mao, A. Fathy
In this paper, we investigate human fall detection using ultra-wideband radar. Our demonstration utilizes a stepped-frequency continuous wave radar (SFCW). In our experiments, instead of utilizing the radar system to measure the Doppler signature of the human, the phase information contained in the obtained complex high resolution range profile (HRRP) is used to derive the motion characteristics of the human, including the instantaneous velocity and acceleration. This can be further utilized for non-contact fall detection and monitoring. The effectiveness of the proposed method is validated using measured results.
{"title":"Phase based motion characteristics measurement for fall detection by using stepped-frequency continuous wave radar","authors":"Haofei Wang, L. Ren, E. Mao, A. Fathy","doi":"10.1109/BIOWIRELESS.2016.7445557","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445557","url":null,"abstract":"In this paper, we investigate human fall detection using ultra-wideband radar. Our demonstration utilizes a stepped-frequency continuous wave radar (SFCW). In our experiments, instead of utilizing the radar system to measure the Doppler signature of the human, the phase information contained in the obtained complex high resolution range profile (HRRP) is used to derive the motion characteristics of the human, including the instantaneous velocity and acceleration. This can be further utilized for non-contact fall detection and monitoring. The effectiveness of the proposed method is validated using measured results.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"493 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116535731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-04DOI: 10.1109/BIOWIRELESS.2016.7445566
M. Tofighi, Jayendrasingh R. Pardeshi, Eric Wasatonic
Toward the objective of using microwave methods to measure blood perfusion, a setup is constructed to obtain thermal washout curves after microwave heating. The setup features an omnidirectional flow in a porous medium irradiated by microwave power. Flow levels in the range of 0-5 mL/min can be precisely set. Such small flow levels realistically correspond to the blood perfusion within tissues. The medium's temperature is raised by 0.2 °C, through irradiating 1.1 W at 900 MHz. Results indicate that small flow levels could be distinctly differentiated by the thermal decay curve. However, the observed heating depth extending beyond 2 cm indicates that higher frequencies may be necessary for shallower perfusion measurements (e.g. in skin).
{"title":"Phantom setup for precise perfusion measurement by microwave","authors":"M. Tofighi, Jayendrasingh R. Pardeshi, Eric Wasatonic","doi":"10.1109/BIOWIRELESS.2016.7445566","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445566","url":null,"abstract":"Toward the objective of using microwave methods to measure blood perfusion, a setup is constructed to obtain thermal washout curves after microwave heating. The setup features an omnidirectional flow in a porous medium irradiated by microwave power. Flow levels in the range of 0-5 mL/min can be precisely set. Such small flow levels realistically correspond to the blood perfusion within tissues. The medium's temperature is raised by 0.2 °C, through irradiating 1.1 W at 900 MHz. Results indicate that small flow levels could be distinctly differentiated by the thermal decay curve. However, the observed heating depth extending beyond 2 cm indicates that higher frequencies may be necessary for shallower perfusion measurements (e.g. in skin).","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115485015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-04DOI: 10.1109/BIOWIRELESS.2016.7445565
S. Afshar, E. Salimi, K. Braasch, M. Butler, D. Thomson, G. Bridges
We present a microfluidic device for measuring the dielectrophoresis (DEP) response of single Chinese hamster ovary cells while in flow. The device measures the sign and amplitude of the DEP induced translation of single cells at two frequencies by sensing the change in impedance at microwave frequency as the cell passes over a multi-electrode transmission line sensor array. The sensor enables the rapid label-free measurement of the dielectric response of each individual cell in a large population of cells. In this paper we present and compare the two-frequency DEP response of viable and non-viable Chinese hamster ovary cells and relate this to their dielectric parameters.
{"title":"Two-frequency dielectrophoresis analysis of viable/non-viable single CHO cells employing a microwave cytometer","authors":"S. Afshar, E. Salimi, K. Braasch, M. Butler, D. Thomson, G. Bridges","doi":"10.1109/BIOWIRELESS.2016.7445565","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445565","url":null,"abstract":"We present a microfluidic device for measuring the dielectrophoresis (DEP) response of single Chinese hamster ovary cells while in flow. The device measures the sign and amplitude of the DEP induced translation of single cells at two frequencies by sensing the change in impedance at microwave frequency as the cell passes over a multi-electrode transmission line sensor array. The sensor enables the rapid label-free measurement of the dielectric response of each individual cell in a large population of cells. In this paper we present and compare the two-frequency DEP response of viable and non-viable Chinese hamster ovary cells and relate this to their dielectric parameters.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115778145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-04DOI: 10.1109/BIOWIRELESS.2016.7445548
Marcus J. Weber, Anirudha Bhat, T. Chang, Jayant Charthad, A. Arbabian
A fully programmable, wirelessly powered optogenetic stimulator system is demonstrated. Implantable devices, with integrated optical stimulators, are powered and controlled using a programmable external ultrasonic transmitter. A methodical analysis is performed to investigate obtainable optical available powers using a highly efficient ultrasonic link. Optical intensities and stimulation patterns practical for optogenetic applications are easily achieved with safe levels of ultrasound. To our knowledge, this is the first ultrasonically powered optogenetic stimulator. The active area of the implantable device measures just 15 mm2.
{"title":"A miniaturized ultrasonically powered programmable optogenetic implant stimulator system","authors":"Marcus J. Weber, Anirudha Bhat, T. Chang, Jayant Charthad, A. Arbabian","doi":"10.1109/BIOWIRELESS.2016.7445548","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445548","url":null,"abstract":"A fully programmable, wirelessly powered optogenetic stimulator system is demonstrated. Implantable devices, with integrated optical stimulators, are powered and controlled using a programmable external ultrasonic transmitter. A methodical analysis is performed to investigate obtainable optical available powers using a highly efficient ultrasonic link. Optical intensities and stimulation patterns practical for optogenetic applications are easily achieved with safe levels of ultrasound. To our knowledge, this is the first ultrasonically powered optogenetic stimulator. The active area of the implantable device measures just 15 mm2.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116405028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-04DOI: 10.1109/BIOWIRELESS.2016.7445550
Lingyun Ren, N. Tran, Haofei Wang, A. Fathy, O. Kilic
The joined range-time-frequency representation of ultra-wideband (UWB) Doppler radar signatures from a walking human subject is processed with a state space method (SSM) in which micro-Doppler (m-D) features are extracted for vital sign analysis. To clearly distinguish respiration rates from moving subjects, the SSM, originally developed for radar target identification and sensor fusion, is applied in a sliding short-time window for enhanced resolution in vital sign detection. This application of SSM to sliding short-time data, termed hereafter as short-time SSM (STSSM), is validated with a full-wave electromagnetic simulation of a walking subject using the Boulic model to represent the kinematics. The scattering model is utilized to calibrate the state space system parameters before it is applied to experimental UWB radar data. The cross correlation and weight functions are utilized to cancel the random motions attributed by walking from a human subject, prior to the application of STSSM to UWB signal. The results show that STSSM can be successfully utilized to accurately measure vital signs in real experimental data, thus demonstrating the capability to positively identify respiration rates even in a low signal-to-noise ratio environment.
{"title":"Analysis of micro-Doppler signatures for vital sign detection using UWB impulse Doppler radar","authors":"Lingyun Ren, N. Tran, Haofei Wang, A. Fathy, O. Kilic","doi":"10.1109/BIOWIRELESS.2016.7445550","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445550","url":null,"abstract":"The joined range-time-frequency representation of ultra-wideband (UWB) Doppler radar signatures from a walking human subject is processed with a state space method (SSM) in which micro-Doppler (m-D) features are extracted for vital sign analysis. To clearly distinguish respiration rates from moving subjects, the SSM, originally developed for radar target identification and sensor fusion, is applied in a sliding short-time window for enhanced resolution in vital sign detection. This application of SSM to sliding short-time data, termed hereafter as short-time SSM (STSSM), is validated with a full-wave electromagnetic simulation of a walking subject using the Boulic model to represent the kinematics. The scattering model is utilized to calibrate the state space system parameters before it is applied to experimental UWB radar data. The cross correlation and weight functions are utilized to cancel the random motions attributed by walking from a human subject, prior to the application of STSSM to UWB signal. The results show that STSSM can be successfully utilized to accurately measure vital signs in real experimental data, thus demonstrating the capability to positively identify respiration rates even in a low signal-to-noise ratio environment.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121412470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-04DOI: 10.1109/BIOWIRELESS.2016.7445553
Songjie Bi, J. Zeng, Marzhan Bekbalanova, D. Matthews, X. Liu
This paper presents quadrature demodulated data on cardiac motion from contact-based measurement using a Doppler radar and a planar antenna. Measurements were taken at several different locations on the chest of the test subject with both vertical and horizontal polarizations. Test data reveals different characteristics in terms of signal amplitude and time-domain waveform depending on the location/polarization, which shows the potential of using contact-based radar measurement for heart monitoring applications.
{"title":"Contact-based radar measurement of cardiac motion — A position and polarization study","authors":"Songjie Bi, J. Zeng, Marzhan Bekbalanova, D. Matthews, X. Liu","doi":"10.1109/BIOWIRELESS.2016.7445553","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445553","url":null,"abstract":"This paper presents quadrature demodulated data on cardiac motion from contact-based measurement using a Doppler radar and a planar antenna. Measurements were taken at several different locations on the chest of the test subject with both vertical and horizontal polarizations. Test data reveals different characteristics in terms of signal amplitude and time-domain waveform depending on the location/polarization, which shows the potential of using contact-based radar measurement for heart monitoring applications.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124470895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-31DOI: 10.1109/BIOWIRELESS.2016.7445546
Jeffrey Mays, Patricia Rampy, D. Sucato, S. Sparagana, J. Chiao
Intraoperative neurophysiological monitoring (IONM) is commonly used in major surgeries such as spinal operations for the rapid detection and remediation of nervous system injuries. Current IONM systems use lengthy wired connections routed past electrical equipment in the operating room (OR). This routing not only crowds the surgical area, but also exposes IONM signals to electromagnetic interference (EMI). A wireless system located near the recording electrodes can be used to reduce EMI and help remove the obstructions created by wired IONM systems. In this work, we demonstrated the effectiveness of a compact wireless system in isolating four critical IONM signals from high levels of EMI found in the OR.
{"title":"A wireless system improves reliability of intraoperative monitoring recordings","authors":"Jeffrey Mays, Patricia Rampy, D. Sucato, S. Sparagana, J. Chiao","doi":"10.1109/BIOWIRELESS.2016.7445546","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445546","url":null,"abstract":"Intraoperative neurophysiological monitoring (IONM) is commonly used in major surgeries such as spinal operations for the rapid detection and remediation of nervous system injuries. Current IONM systems use lengthy wired connections routed past electrical equipment in the operating room (OR). This routing not only crowds the surgical area, but also exposes IONM signals to electromagnetic interference (EMI). A wireless system located near the recording electrodes can be used to reduce EMI and help remove the obstructions created by wired IONM systems. In this work, we demonstrated the effectiveness of a compact wireless system in isolating four critical IONM signals from high levels of EMI found in the OR.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124160690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/BIOWIRELESS.2016.7445569
Mohammad J. Abu-Saude, B. Morshed
Traditional wet or gel electrodes are not suitable for long duration neuro-physiological monitoring. Dry electrodes for impedimetric sensing of physiological parameters (such as ECG, EEG, and GSR) promise the ability for long duration monitoring. We have previously demonstrated a novel nanotechnology based dry electrode configuration fabricated with patterned vertically-aligned carbon nanotube (pvCNT) for neuro-physiological impedimetric measurements. However, the fabricated sensors were mechanically weakly adhered to the substrate. This paper describes a coating mechanism of pvCNT with a thin layer of conductive polymer, Polypyrrole (PPy), to increase mechanical stability, while preserving superior impedance properties of pvCNT. The electrodes were fabricated on circular stainless-steel (SS) foil substrate (φ = 10 mm, and thickness = 2 mils). Electrically conductive multi-walled CNT were grown in pattered pillar formation with a square base of 100 μm each side, and an inter-pillar spacing of 200 μm. The heights of the pillars were between 1 to 1.5 mm. The coating procedure involved applying 10 μL of PPy after preparing the pvCNT with 70% ethyl alcohol solution, and flash drying at 300°C. A comparative test with commercial ECG electrodes and non-coated version show that coated pvCNT has lower electrical impedance compared to commercial electrode whereas higher impedance compared to non-coated version. The signal capture were comparable for all electrodes in vitro. The peel test reveal much stronger mechanical adhesion of the pvCNT with the SS substrate when coated with PPy. The results demonstrate the feasibility of coating pvCNT dry electrodes with PPy for robustness.
{"title":"Polypyrrole (PPy) conductive polymer coating of dry patterned vertical CNT (pvCNT) electrode to improve mechanical stability","authors":"Mohammad J. Abu-Saude, B. Morshed","doi":"10.1109/BIOWIRELESS.2016.7445569","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445569","url":null,"abstract":"Traditional wet or gel electrodes are not suitable for long duration neuro-physiological monitoring. Dry electrodes for impedimetric sensing of physiological parameters (such as ECG, EEG, and GSR) promise the ability for long duration monitoring. We have previously demonstrated a novel nanotechnology based dry electrode configuration fabricated with patterned vertically-aligned carbon nanotube (pvCNT) for neuro-physiological impedimetric measurements. However, the fabricated sensors were mechanically weakly adhered to the substrate. This paper describes a coating mechanism of pvCNT with a thin layer of conductive polymer, Polypyrrole (PPy), to increase mechanical stability, while preserving superior impedance properties of pvCNT. The electrodes were fabricated on circular stainless-steel (SS) foil substrate (φ = 10 mm, and thickness = 2 mils). Electrically conductive multi-walled CNT were grown in pattered pillar formation with a square base of 100 μm each side, and an inter-pillar spacing of 200 μm. The heights of the pillars were between 1 to 1.5 mm. The coating procedure involved applying 10 μL of PPy after preparing the pvCNT with 70% ethyl alcohol solution, and flash drying at 300°C. A comparative test with commercial ECG electrodes and non-coated version show that coated pvCNT has lower electrical impedance compared to commercial electrode whereas higher impedance compared to non-coated version. The signal capture were comparable for all electrodes in vitro. The peel test reveal much stronger mechanical adhesion of the pvCNT with the SS substrate when coated with PPy. The results demonstrate the feasibility of coating pvCNT dry electrodes with PPy for robustness.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129731922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/BIOWIRELESS.2016.7445574
R. Caverly
A study using a PIN diode switched version of a linear balanced duplexer (LBD) for use in a 7 T (298 MHz) magnetic resonance imaging application is described. A prototype LBD TR switch was fabricated on FR-4 and modeled using a complex impedance model of the PIN diode and shows good insertion loss and isolation performance at 298 MHz. The scattering matrix analysis presented in the paper is verified with experimental data that show good agreement with the model.
本文描述了在7 T (298 MHz)磁共振成像应用中使用PIN二极管开关版本的线性平衡双工器(LBD)的研究。在FR-4上制作了一个LBD TR开关原型，并利用PIN二极管的复杂阻抗模型进行建模，在298 MHz下显示出良好的插入损耗和隔离性能。用实验数据验证了本文提出的散射矩阵分析方法，结果与模型吻合较好。
{"title":"PIN diode-based transmit-receive switch for 7 T MRI","authors":"R. Caverly","doi":"10.1109/BIOWIRELESS.2016.7445574","DOIUrl":"https://doi.org/10.1109/BIOWIRELESS.2016.7445574","url":null,"abstract":"A study using a PIN diode switched version of a linear balanced duplexer (LBD) for use in a 7 T (298 MHz) magnetic resonance imaging application is described. A prototype LBD TR switch was fabricated on FR-4 and modeled using a complex impedance model of the PIN diode and shows good insertion loss and isolation performance at 298 MHz. The scattering matrix analysis presented in the paper is verified with experimental data that show good agreement with the model.","PeriodicalId":154090,"journal":{"name":"2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129264005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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